选用恰当的方法计算下面各题. ①12.5×8.8÷11 ②4.6×38.7+4.6×61+4.6×0.3 ③0.125×
来源:学生作业帮 编辑:大师作文网作业帮 分类:综合作业 时间:2024/11/12 05:11:07
选用恰当的方法计算下面各题.
①12.5×8.8÷11 | ②4.6×38.7+4.6×61+4.6×0.3 |
③0.125×0.25×32 | ④1.7÷〔6.6-28.8÷9)〕 |
(1)12.5×8.8÷11,
=110÷11,
=10;
(2)4.6×38.7+4.6×61+4.6×0.3,
=4.6×(38.7+61+0.3),
=4.6×100,
=460;
(3)0.125×0.25×32,
=0.125×0.25×4×8,
=(0.125×8)×(0.25×4),
=1×1,
=1;
(4)1.7÷〔6.6-28.8÷9),
=1.7÷(6.6-3.2),
=1.7÷3.4,
=0.5.
=110÷11,
=10;
(2)4.6×38.7+4.6×61+4.6×0.3,
=4.6×(38.7+61+0.3),
=4.6×100,
=460;
(3)0.125×0.25×32,
=0.125×0.25×4×8,
=(0.125×8)×(0.25×4),
=1×1,
=1;
(4)1.7÷〔6.6-28.8÷9),
=1.7÷(6.6-3.2),
=1.7÷3.4,
=0.5.